R.L. Sandstrom, W.J. Gallagher, et al.
Applied Physics Letters
We report the first contact-free measurements of the upper critical fields, Hc2(T), of single-crystal Y1Ba2Cu3O7-x. In contrast to resistive measurements reported by others, we find that the anisotropy near Tc is temperature independent in agreement with the expectations of anisotropic Ginzburg-Landau theory. Estimates of the anisotropic Ginzburg-Landau and London parameters are reported. These indicate that despite the large anisotropy in Hc2 (5:1), the inferred low-temperature interplanar coherence length (̂>z=7 AÌ̂>) remains larger than the Cu-O layer spacing of 3.9 AÌ̂>. The superconductivity in Y1Ba2Cu3O7-x thus remains fundamentally three dimensional in nature for a substantial temperature range below Tc. © 1987 The American Physical Society.
R.L. Sandstrom, W.J. Gallagher, et al.
Applied Physics Letters
S. Assefa, J.Z. Sun, et al.
INTERMAG 2006
B.D. Schrag, A. Anguelouch, et al.
Journal of Applied Physics
Y. Yeshurun, A.P. Malozemoff, et al.
Cryogenics